feat(chart): add GraphType::Bar

[joshka]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.4%. Comparing base (3e7458f) to head (f6a5bcf).
Report is 10 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1205   +/-   ##
=====================================
  Coverage   94.4%   94.4%           
=====================================
  Files         62      62           
  Lines      15048   15092   +44     
=====================================
+ Hits       14217   14261   +44     
  Misses       831     831           

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[joshka]

Inspired by btop, it might be nice to be able to have graphs that can be bar charts and not just lines / scatter.

[joshka]

@ratatui-org/maintainers review-plz. This is a pretty small easy feature to approve.

[EdJoPaTo]

We should get #1166 merged…

$ cargo semver-checks
     Parsing ratatui v0.27.0 (current)
      Parsed [  20.007s] (current)
     Parsing ratatui v0.27.0 (baseline)
      Parsed [  18.716s] (baseline)
    Checking ratatui v0.27.0 -> v0.27.0 (no change)
     Checked [   0.110s] 76 checks: 75 pass, 1 fail, 0 warn, 0 skip

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.33.0/src/lints/enum_variant_added.ron

Failed in:
  variant GraphType:Bar in …/ratatui/src/widgets/chart.rs:155

[joshka]

Yeah, I think we actually need to mark a bunch of places as non-exhaustive like this where we might reasonably expect to add fields.